Summary of feature:
Do not mute notifications when speech recognition recording is
active, but when an app has requested audio focus with
AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE.
Implementation:
Move definition of AUDIOFOCUS_NONE to AudioManager where other
audio focus codes are defined.
Add support for querying the current audio focus type.
When audio focus is requested as GAIN_TRANSIENT_EXCLUSIVE, make
the corresponding loss by LOSS_TRANSIENT.
Before playing a notification, check whether GAIN_TRANSIENT_EXCLUSIVE
has been requested.
Bug 8251963
Change-Id: I41edc77326b70639d2fdcb4642c53109995b72a8
2380566deb